CN101072912B - Method of deinking recycled paper employing centrifugal cleaners - Google Patents
Method of deinking recycled paper employing centrifugal cleaners Download PDFInfo
- Publication number
- CN101072912B CN101072912B CN2005800356462A CN200580035646A CN101072912B CN 101072912 B CN101072912 B CN 101072912B CN 2005800356462 A CN2005800356462 A CN 2005800356462A CN 200580035646 A CN200580035646 A CN 200580035646A CN 101072912 B CN101072912 B CN 101072912B
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- filtrate
- paper
- paper pulp
- pulp
- ink particle
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
- Cyclones (AREA)
- Filtering Materials (AREA)
Abstract
A method of deinking recycled cellulosic paper including the steps of developing a pulp containing paper fibers and bundles of paper fibers in a pulping liquid and an agglomerating agent, subjecting the pulp to a screening treatment, storing the filtrate from the screening treatment, and which includes residual pulping chemicals, in a vessel for a time sufficient to effect a change in the geometry or other characteristic (other than size) of individual ones of the ink particles in the filtrate, and thereafter subjecting the pulp withdrawn from the vessel to a cyclone cleaner treatment to deplete the pulp of modified ink particles and develop a pulp containing paper fibers and substantially fewer ink particles relative to the quantity of ink particles present in the screen filtrate, and collecting the pulp of depleted ink particle content for use in a papermaking operation.
Description
Technical field
The present invention relates to the deinking of the plain paper of reclaimed fibre, and the method that is specifically related to that ink particle is separated with cellulose fibre and from fiber pulp and the ink particle that separates, removes the ink particle that separates.
Background technology
The reuse of cellulose paper is the main activities in the paper industry.Some waste paper as " office waste " in, the subject matter of reuse method is paper fiber or fritter paper fiber and the separating of the ink particle of having displaced from reuse paper.Office papers or " office waste " are the terms that uses when the paper waste product is derived from office etc. indicating.Office waste generally includes relatively large from for example being used for duplicator, computer printer and other is administered to printing ink physics in the printing ink in the sources such as toner of the device on the cellulose paper.
In a single day common printing ink is look or other coloured particle form darkly, and is administered on the paper, particle can combine (being " fusion " sometimes) forcefully with the paper fiber.Therefore, the initial effort to the reuse of the paper printed is to displace ink particle from the paper fiber.In the reuse of paper, this is divided into very little sheet by the paper that will print usually, perhaps described very little sheet is changed simultaneously or subsequently into the paper pulp that contains paper pulp liquid, fiber and fubril bundle, and ink particle is displaced.The ink particle of displacing can be bigger or little than each paper fiber.
In some cases, the agglomeration chemicals is added in the paper pulp so that less ink particle is merged into bigger ink particle.The paper pulp that to so the handle processing of sieving then, wherein fiber and less ink particle pass through mesh screen with carrier liquid.Use the whirlwind clarifier to handle then from the filtrate of sieving of containing fiber and less ink particle, wherein will little ink particle and the output materials flow of fiber separation with acquisition carrier liquid and fiber, wherein some have kept the ink particle that adsorbs.This output materials flow contains the slurries of fiber and little ink particle.
The waste product that sieves comprises bigger fibre bundle, all contaminations such as plastics, does not pass through the ink particle of sieve aperture and the printing ink that the residual fiber with in the fibre bundle combines.
Its whole content is incorporated this paper United States Patent (USP) 5 as a reference at this, 512, the specification of de-inking method is provided in 133, it comprises qualification " printing ink ", be combined with the source of the reuse paper of printing ink, make the art methods of paper deinking, and use coagulating agent, sieve, the de-inking method of whirlwind clarifier and flotation step.
Its whole content is incorporated at this provides the specification that uses the whirlwind centrifuge in the deinking of reuse paper in this paper United States Patent (USP) 3,635,788 as a reference.
Find pulp processing that traditional deinking system uses multistep from above improving pulp quality and cleannes, it comprises and is used to sieve, the step of the equipment of centrifugal clarification, flotation, washing, compacting, dispersion and bleaching.In the example of flotation step, usually need be in the dense disperser of height pre-dispersed printing ink thoroughly to make printing ink and from fiber, separate and to be broken down into the subparticle that can successfully remove by flotation step.This scatter operation comprises that with paper pulp enrichment to denseness be 25-35%, be heated with steam then, then in refiner type device with its dispersion.In order in flotation step, to remove removal ink pulp thickness is reduced to about 1% subsequently.
Disperse to have the high capital cost that is used for large equipment after the flotation, and drubber is had big space requirement.It also comprises because the high running cost due to the essence fiber loss in thickening and flotation step, the horsepower and the use of steam of height, and high equipment maintenance cost.Yet dispersion/flotation is usually employed, and this is because it is very effective to the cleannes of improvement de inked pulp.In fact on two points that separate of deinking system, use dispersion/flotation to realize enough paper pulp cleaning degree at the most modern deinking system of office waste operation.Significantly, this dual arrangement has extra high capital cost and high running cost.
Disperse after the flotation also can be added in the agglomeration de-inking method to improve the removal of ink particle.Therefore be apparent that the alternative method that makes the recycled fibrous paper deinking that a kind ofly to use agglomeration system and not use dispersion/flotation concepts.
Summary of the invention
In this application, term " dirt " comprises printing ink and " goo ", and any other type in by the formed paper of reuse paper pulp as the visible pollutant of black particle.
According to an aspect of the present invention, a kind of method that makes the plain paper deinking of reclaimed fibre is provided, it may further comprise the steps: be formed on the paper pulp that contains paper fiber and paper fibre bundle and coagulating agent in the paper pulp liquid, with the processing of sieving of described paper pulp, the filtrate storage that to handle and comprise residual pulping chemical and/or coagulating agent in container from sieving is enough to make the shape of each ink particle in the filtrate or the time that other character (except that size) changes for one section, then will by the paper pulp that takes out in the container carry out the whirlwind clarifier handle with from paper pulp, remove modification and other ink particle and forming contains the paper fiber and substantially than the paper pulp of the ink particle amount ink particle still less that exists in the filtrate of sieving, and collect this paper pulp of removing the ink particle content and operate to be used for papermaking.In the present invention, the modification of described ink particle does not need external additive such as chemicals and does not need to stir reservoir vessel and realize.
According to another aspect of the present invention, inventors have used diameter less than 5 inches whirlwind clarifier, and preferred diameter is about 3 inches whirlwind clarifier.
The specific embodiment
In the methods of the invention, a certain amount of reuse paper such as office waste are added in the pulper with conventional slurrying liquid and coagulating agent, all are known in the prior art.In pulper, ink particle to be displaced from the cellulose fibre of paper and paper is decomposed into fiber and fiber block, wherein some may comprise residual ink particle.Can use the routine operation parameter of pulping process.
After the paper pulp formation/ink agglomeration operation, use conventional mesh screen under the routine operation parameter, the paper pulp of gained to be sieved.
According to an aspect of the present invention, will stay those fiber blocks on the mesh screen and the ink agglomeration body is removed and they are transferred to anyly be used for remote storage, reclaimer operation, introduce several places of subsequently slurrying operation etc. again.Comprise fiber, possible some fubril piece and the ink particle by mesh screen from the filtrate of sieving.Some fiber or fiber block may comprise the residual ink particle that is adsorbed in fiber.The suitable mesh screen that is used for this method is the mesh screen that has by the slotted eye type sieve aperture of mesh screen.Have been found that width is that about 0.004 inch to 0.006 inch slotted eye is suitable for separating the cellulose fibre from recycled office waste.From other cellulose fibre that is combined with the reuse paper source of printing ink can use as slurrying and sieve the operation process.After sieving, can use the centrifugal clarification step of centrifugal clarification or a plurality of series connection and further purify paper pulp.Hope these sieve and the centrifugal clarification step after produce the TAPPI dirt count less than 200ppm, preferably less than the paper pulp of 100ppm.
In the methods of the invention, will be from sieving or the filtrate of centrifugal clarification operation be transferred in the reservoir vessel, for example in the slurrying operation in the tower of common type.Filtrate in the storage process of reservoir vessel, with each ink particle of disposing in the filtrate the expose to the sun any residual pulping chemical in paper pulp, any residual coagulating agent etc.Yet, find that further described each ink particle of disposing can not carry out the material agglomeration in the filtrate that stores.This factor is entering reservoir vessel and the physical size after its time of staying in reservoir vessel is confirmed by detecting each ink particle.On the contrary, have been found that each ink particle has carried out alteration of form at least, be specially and in its stop process in reservoir vessel, take the more spheroidal shape of class.Yet known imprecisely, it is believed that at paper pulp the keyed jointing (physics or chemistry) between the ink particle that is adsorbed in the paper fiber is died down that the result makes this ink particle separate with their fibrous body.No matter can be which kind of mechanism, the present invention finds ink particle that those have separated with its fibrous body and/or the form of the ink particle that fluffs with its main fibre, advantageously change in the stop process of reservoir vessel at them, this can be confirmed with separating of paper pulp by having strengthened them in the cyclone separator processing that stores in the paper pulp later stage.
Filtrate can change in about 30 minutes to about 24 hours between the storage life in reservoir vessel.Still less time of staying does not have effect to the post processing that strengthens filtrate in reservoir vessel, and be longer than that about 24 hours time of staying reduces the enhancing of dirt count in the paper pulp of realizing being obtained by this method is unnecessary, in any case and, should the long time of staying be tending towards providing unacceptable cost and benefit ratio.It is unnecessary stirring paper pulp in reservoir vessel.
When between the required storage life, finishing, filtrate infeeded and, fiber is separated by centrifugal action with ink particle at this by cyclone separator.In fact, except that other factors,, can use an a plurality of even hundreds of cyclone separator of operation repetitive based on design current velocity from the paper pulp of reservoir vessel.
For the explanation of suitable cyclone separator and method of operating thereof referring to United States Patent (USP) 3,635,788.Basically, will be fed in the cyclone separator by this tower by the paper pulp that storage tower is confessed in the present invention, solid (being mainly dirt and ink particle) is discharged towards the ground migration of the downward spiral vortex of outlet and via the bottom of separator flask at this.To contain the residue paper pulp from the separator inside vortex that is retained in no matter which kind of solid (fiber) wherein and discharge by top nozzle, all these all are known in the prior art.
According to an aspect of the present invention, the maximum gauge of each used cyclone separator is less than 5 inches, and preferred maximum gauge is about 3 inches.Have been found that the gravity that demonstrates the big several times of bigger separator than the separator of minor diameter, therefore the separator separative efficiency that strengthens is provided.
No matter the enhancing efficient of this separator itself, inventors have been found that when processing contains the reuse paper that is combined with printing ink, with directly to enter the processing of paper pulp of cyclonic separation operation by sieve operation or other whirlwind purification run opposite, when identical paper pulp when in reservoir vessel, storing about 30 minutes to about 24 hours under the static state, the efficient of the printing ink purification of measuring by the TAPPI dirt count significantly increases.It should be noted this efficient increase it is believed that be those each expose to the sun in relevant with de-inking method and be retained in the function of the time of the processing chemicals in the paper pulp with ink particle that its fibrous body is separated, and/or it is believed that be because the expansion of some other X factor such as paper fiber, those ink particles (sieve and purification run after continue with its paper fibrous body keyed jointing and continue to enter the ink particle of reservoir vessel) keyed jointing (physics and/or chemistry) or these combination and/or the other factors that die down.No matter carried out which kind of mechanism in reservoir vessel, what confirmed is because their time of staying in reservoir vessel, and the shape that is present in reservoir vessel and enters each ink particle of separator does not demonstrate the change of any scantling.In the stop process of reservoir vessel, do not notice the agglomeration of ink particle at paper pulp.
Example I
De inked pulp is by the commercial agglomeration drubber of office waste as raw material obtained.This device uses 0.004 inch slotted eye mesh screen and use centrifugal purifier in procedure of processing.The diameter of the first cover centrifugal purifier is that 6 inches and dirt removal efficiency are 85%.The diameter of the second cover centrifugal purifier is that 2.5 inches and dirt removal efficiency are 70%.The diameter of the 3rd cover centrifugal purifier is that 2.5 inches and dirt removal efficiency are 55%.Then de inked pulp is stored 2 hours in storage tower, process by the centrifugal purifier of 3 inch diameters then.Dirt count is 28.4ppm in the paper pulp before purifying.The Black Clawson Ultra-Clone clarifier of operating down with 4.7% waterpower clearance (reject rate) falls in this clarifier for the pressure at 31psi.The pulp thickness that infeeds clarifier be 0.99% and the pulp thickness accepted of clarifier be 0.81%.The paper pulp of being accepted by clarifier has the dirt count of 4.2ppm.The dirt removal efficiency that is obtained by this clarifier is 85%.This very high dirt removal efficiency has been produced the enough paper pulp of low dirt count that has that is used for high-quality printing and writing paper.
Example II
De inked pulp is by using 0.006 inch the slotted eye mesh screen and the agglomeration drubber of the series connection of 2 steps in procedure of processing centrifugal purifier to obtain.First the cover centrifugal purifier diameter be 6 inches and second the cover centrifugal purifier diameter be 2.5 inches.De inked pulp is stored 6 hours, purify and further processing by the centrifugal purifier that uses 2.5 inch diameters then.Paper pulp dirt count before purifying is 79ppm.This clarifier the pressure of 18psi fall with 4.0% waterpower clearance under operate.The paper pulp that this clarifier is accepted has the dirt count of 9ppm.Dirt removal efficiency is 89%.
EXAMPLE III
De inked pulp by with example II in identical agglomeration drubber obtain.Use then with example II in identical storage and purification method process this de inked pulp, difference be clarifier the pressure of 21psi fall with 8% waterpower clearance under operate.Paper pulp dirt count before purifying is that the dirt count after 86ppm and the purification is 18ppm.Dirt removal efficiency in this clarifier is 79%.
EXAMPLE IV
De inked pulp is by using 0.004 inch the slotted eye mesh screen and the agglomeration drubber of the series connection of 3 steps in procedure of processing centrifugal clarification to obtain.Paper pulp is stored 3 hours, then the pressure of 18psi fall with 6% waterpower clearance under use the centrifugal purifier of 2.5 inch diameters to purify and with its processing.The paper pulp dirt count that infeeds clarifier is 15ppm, and the paper pulp dirt count that this clarifier is accepted is 0ppm.By the dirt removal efficiency of processing in this centrifugal purifier is 100%.
EXAMPLE V
De inked pulp by with EXAMPLE IV in identical agglomeration drubber obtain.Use then with EXAMPLE IV in identical storage and purification method process this paper pulp, difference is that the waterpower clearance is 4%.By via the processing of this clarifier being that 93% dirt count is reduced to 1ppm by 15ppm with dirt removal efficiency.
Notice that in the embodiment shown in above conventional pulping device and machined parameters can be used for obtaining paper pulp, comprise the agglomeration of ink particle.In addition, also can use conventional pulp screens and the operating parameter that meets slotted eye size restrictions mentioned above.Though specified special cyclone separator in an embodiment, be understood that the words that need can be with the cyclone separator of other the commercial brand that is suitable for realizing this method operating condition.
In above embodiment, coagulating agent is the mixture of one or more C5-C20 alkanols well known in the art and non-ionic surface active agent.The consumption of surfactant is the 0.3-0.5 weight % of slurrying dried fiber when beginning.
In the present invention, paper pulp can be stored in reservoir vessel with any common consistency, for example common storage consistency is about 5% to 30%, preferred about 10% to 15%.Be lower than about 5% pulp thickness and need unusual big reservoir vessel for given paper pulp volume.Pulp thickness greater than about 30% needs particular processing equipment.
Sieve the storage of filtrate of operation from the present invention can be at the tower of the common type that is used for the slurrying process equipment.For example in above example I, IV and V, reservoir vessel is for highly being that 75 feet and diameter are 30 feet tower.In above example II and III, the height of tower is that 90 feet and diameter are 35 feet.
Claims (14)
1. method that makes the reclaimed fibre cellulose fiber deinking that is combined with printing ink, it may further comprise the steps:
A. produce paper pulp by the reclaimed fibre cellulose fiber, described paper pulp comprises cellulose fibre, ink particle and coagulating agent,
B. the processing of described paper pulp being sieved forms and comprises particle mean size less than the paper fiber of this mesh screen hole dimension and the filtrate of ink particle,
C. described filtrate is stored one period scheduled time that is enough to change ink particle shape in the described filtrate in container, and,
D. described filtrate is shifted to carry out the whirlwind purified treatment by taking-up in the described container and with described filtrate, wherein described filtrate is removed ink particle to produce useful paper making pulp.
2. the method for claim 1, the described step handled of wherein described paper pulp being sieved comprises described paper pulp is deposited on the mesh screen, described mesh screen has a plurality of holes of passing wherein, the ink particle that the size in described hole is enough to make paper fiber and size be similar to described paper fiber size passes through through it, forms the filtrate of containing paper fiber and ink particle.
3. the method for claim 2, each in wherein said a plurality of holes of passing described mesh screen comprises the slotted eye that width is not more than 0.006 inch.
4. the process of claim 1 wherein that the step that described filtrate is carried out the whirlwind purification run comprises that being not more than 3 inches whirlwind clarifier by diameter processes described filtrate.
5. the method for claim 1, wherein described paper pulp demonstrates first TAPPI dirt count before described whirlwind purifying step, and the described paper pulp of accepting described whirlwind purifying step demonstrates, and to represent purification efficiency be 79% or second above TAPPI dirt count.
6. the process of claim 1 wherein that described reuse paper is the office waste class.
7. the process of claim 1 wherein that before storing described paper pulp demonstrates the TAPPI dirt count less than 200ppm.
8. the method for claim 5, wherein the TAPPI dirt count of described paper pulp is 0 to 18ppm after whirlwind purifies.
9. the method for claim 1 before it is included in and is stored in described filtrate in the described reservoir vessel is carried out described filtrate the step of purified treatment.
10. the method for claim 9, wherein said purified treatment is the whirlwind purified treatment.
11. the process of claim 1 wherein that the time of staying of described paper pulp in described reservoir vessel is 0.5 hour to 24 hours.
12. the process of claim 1 wherein that denseness dry fiber weight in the filtrate when described filtrate is introduced described reservoir vessel of described filtrate is 5% to 15%.
13. the process of claim 1 wherein that the described coagulating agent that is present in the described paper pulp is 0.1% to 2.0% based on the dry fiber weight in the described paper pulp.
14. a system that makes the plain paper deinking of reclaimed fibre that is combined with printing ink, it comprises:
Pulper, this pulper comprise the paper pulp liquid that contains the coagulating agent that is useful on described printing ink, and are used to receive the described paper that is combined with printing ink, and described paper is converted into each cellulose fibre,
Mesh screen, this mesh screen has the hole of passing wherein, and the ink particle that is used to make each cellulose fibre and size be similar to described cellulose fibre size is by containing the filtrate of cellulose fiber peacekeeping ink particle with qualification,
Reservoir vessel, this reservoir vessel are used for receiving and keep shape that described filtrate is enough to make described ink particle at least in the time that described storage filtrate changes,
Cyclone separator, this cyclone separator are used for receiving described filtrate and the described ink particle that has changed shape being separated with described cellulose fibre from described reservoir vessel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/953,090 | 2004-09-29 | ||
| US10/953,090 US7534322B2 (en) | 2004-09-29 | 2004-09-29 | Method of deinking recycled paper employing centrifigal cleaners |
| PCT/US2005/031403 WO2006039054A1 (en) | 2004-09-29 | 2005-09-02 | Method of deinking recycled paper employing centrifigal cleaners |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101072912A CN101072912A (en) | 2007-11-14 |
| CN101072912B true CN101072912B (en) | 2010-09-08 |
Family
ID=35525618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800356462A Expired - Fee Related CN101072912B (en) | 2004-09-29 | 2005-09-02 | Method of deinking recycled paper employing centrifugal cleaners |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US7534322B2 (en) |
| CN (1) | CN101072912B (en) |
| RU (1) | RU2358054C2 (en) |
| WO (1) | WO2006039054A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831821B (en) * | 2010-03-12 | 2011-08-10 | 福建希源纸业有限公司 | Production method of tissue paper |
| WO2015006362A1 (en) | 2013-07-11 | 2015-01-15 | Invista Technologies S.A.R.L. | Processes for removal of contaminants from cellulosic material |
| CN110714350A (en) * | 2019-10-31 | 2020-01-21 | 佛山市拓昕包装有限公司 | Waste paper recycling device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1228276A (en) * | 1968-04-22 | 1971-04-15 | ||
| CN1087560A (en) * | 1992-05-15 | 1994-06-08 | 利乐拉瓦尔集团及财务有限公司 | Method and apparatus and products obtained therefrom from mixing waste separating paper fiber and plastics |
| WO1996019613A1 (en) * | 1994-12-20 | 1996-06-27 | Knowaste Technologies Inc. | Recycling of coated paperboard |
| US5876559A (en) * | 1991-06-25 | 1999-03-02 | International Paper Company | Deinking of impact and non-impact printed paper by an agglomeration process |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3635788A (en) | 1971-01-22 | 1972-01-18 | Harry J Braun | Deinking and removal of certain contaminants from reclaimed paper stock-heavying |
| US4076578A (en) | 1974-10-21 | 1978-02-28 | Canadian Patents And Development Limited | Ink removal from waste paper |
| CA1249903A (en) | 1984-05-10 | 1989-02-14 | Christopher C. Mollett | Composition and method of deinking of recycled cellulosic material |
| US4820379A (en) | 1986-10-16 | 1989-04-11 | Ppg Industries, Inc. | Method for deinking wastepaper with a halogenated polyethylene oxide and a polymeric material |
| US5059280A (en) | 1989-07-31 | 1991-10-22 | Kimberly-Clark Corporation | Method for removing agglomerated particles after dry fiberizing wastepaper |
| US5259969A (en) | 1991-09-16 | 1993-11-09 | International Paper Company | Deinking of impact and non-impact printed paper |
| US5234543A (en) | 1991-10-03 | 1993-08-10 | International Paper Company | Deinking method using ink agglomeration |
| US5340439A (en) | 1992-08-06 | 1994-08-23 | International Paper Company | Method for removing ink from printed paper using agglomerating agent, followed by addition of talc |
| US5405495A (en) | 1993-07-02 | 1995-04-11 | Nalco Chemical Company | Recycling of xerographic waste paper using organic particulates |
| US5453159A (en) | 1993-11-04 | 1995-09-26 | International Paper Company | Deinking of recycled pulp |
| US5512133A (en) * | 1994-08-01 | 1996-04-30 | International Paper Company | Method for deinking recycled paper using a low flow elongated open top flotation vessel |
| CA2199745A1 (en) * | 1994-09-12 | 1996-03-21 | David A. Longhini | Deinking composition and method for deinking waste paper |
| US5580446A (en) | 1994-10-20 | 1996-12-03 | International Paper Company | Screen, vortex apparatus for cleaning recycled pulp and related process |
| US5665205A (en) | 1995-01-19 | 1997-09-09 | International Paper Company | Method for improving brightness and cleanliness of secondary fibers for paper and paperboard manufacture |
| US5865947A (en) | 1995-05-18 | 1999-02-02 | International Paper Company | Method for recycling mixed wastepaper including plastic-containing paper and ink printed paper |
| US5733412A (en) | 1995-09-13 | 1998-03-31 | International Paper Company | Decolorizing brown fibers in recycled pulp |
| US5766448A (en) | 1996-09-25 | 1998-06-16 | International Paper Company | Pressure screening system for processing contaminated pulp fiber |
-
2004
- 2004-09-29 US US10/953,090 patent/US7534322B2/en not_active Expired - Fee Related
-
2005
- 2005-09-02 RU RU2007114623A patent/RU2358054C2/en not_active IP Right Cessation
- 2005-09-02 CN CN2005800356462A patent/CN101072912B/en not_active Expired - Fee Related
- 2005-09-02 WO PCT/US2005/031403 patent/WO2006039054A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1228276A (en) * | 1968-04-22 | 1971-04-15 | ||
| US5876559A (en) * | 1991-06-25 | 1999-03-02 | International Paper Company | Deinking of impact and non-impact printed paper by an agglomeration process |
| CN1087560A (en) * | 1992-05-15 | 1994-06-08 | 利乐拉瓦尔集团及财务有限公司 | Method and apparatus and products obtained therefrom from mixing waste separating paper fiber and plastics |
| WO1996019613A1 (en) * | 1994-12-20 | 1996-06-27 | Knowaste Technologies Inc. | Recycling of coated paperboard |
Also Published As
| Publication number | Publication date |
|---|---|
| US20060065376A1 (en) | 2006-03-30 |
| CN101072912A (en) | 2007-11-14 |
| RU2358054C2 (en) | 2009-06-10 |
| RU2007114623A (en) | 2008-10-27 |
| US7534322B2 (en) | 2009-05-19 |
| WO2006039054A1 (en) | 2006-04-13 |
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